Official Windows 10 Mobile update finally available for the Lumia 640 XL

AT&T has finally started rolling out Windows 10 Mobile for the Lumia 640 XL. After a long wait, if you own a Lumia 640 XL, you will be able to get Windows 10 on it using the Upgrade Advisor app. We have seen reports regarding the update on Reddit with the new OS version being 10.0.14393.321 , and the update was also confirmed by an AT&T representative at the AT&T Forums.